headquartersNoun1. (usually plural) the office that serves as the administrative center of an enterprise; "many companies have their headquarters in New York" (synonym) central office, main office, home office, home base (hypernym) office, business office (hyponym) mukataa (classification) plural, plural form2. (usually plural) the military installation from which a commander performs the functions of command; "the general's headquarters were a couple of large tents" (synonym) HQ, military headquarters (hypernym) military installation (hyponym) command post, general headquarters, GHQ (classification) military, armed forces, armed services, military machine, war machine (classification) plural, plural form3. (plural) a military unit consisting of a commander and the headquarters staff (hypernym) military unit, military force, military group, force (hyponym) Allied Command Atlantic, ACLANT (part-meronym) headquarters staff (classification) military, armed forces, armed services, military machine, war machine (classification) plural, plural form